don't allow ZST in ScalarInt
There are several indications that we should not ZST as a ScalarInt: - We had two ways to have ZST valtrees, either an empty `Branch` or a `Leaf` with a ZST in it. `ValTree::zst()` used the former, but the latter could possibly arise as well. - Likewise, the interpreter had `Immediate::Uninit` and `Immediate::Scalar(Scalar::ZST)`. - LLVM codegen already had to special-case ZST ScalarInt. So instead add new ZST variants to those types that did not have other variants which could be used for this purpose.
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